Soft handoff and uplink capacity in a two-tier CDMA system

Authors:
S. Kishore;L. J. Greenstein;H. V. Poor;S. C. Schwartz
Affiliations:
Dept. of Electr. & Comput. Eng., Lehigh Univ., Bethlehem, PA, USA;-;-;-
Venue:
IEEE Transactions on Wireless Communications
Year:
2005

Citing 0
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Abstract

This paper examines the effect of soft handoff on the uplink user capacity of a code division multiple access system consisting of a single macrocell in which a single hotspot microcell is embedded. The users of these two base stations operate over the same frequency band. In the soft-handoff scenario studied here, both macrocell and microcell base stations serve each system user, and the two received copies of a desired user's signal are summed using maximal ratio combining. Exact and approximate analytical methods are developed to compute uplink user capacity. Simulation results demonstrate a 20% increase in user capacity compared to hard handoff. In addition, simple approximate methods are presented for estimating soft-handoff capacity and are shown to be quite accurate.